Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1de183452df330…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 19:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a7b9f88c52d0327c712193c070d4c86 SHA-1: e8097d284e970cecde6cd1b6f20d2dfe8afa11c1 SHA-256: 4e1de183452df330de5677dd9500c10b5b9c934a8884d2092c29a2db851a203c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites and potentially malicious PDF files, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chingchia.com/uploads/files/202109112323201786.pdf In PDF document text
    • https://artistprasanna.com/userfiles/file/bevukosogefoxeza.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/roziwegupisebuwoloz.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613678af6d699---20492217378.pdfIn PDF document text
    • https://airshow-bg.com/file/lututatopinasej.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/10223481105.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef40f60ab6---10603244274.pdfIn PDF document text
    • http://le383.com/uploads/files/pufufewudim.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/87988301394.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/sabibobowegojuden.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/45226136626.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/35835647258.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/50353524575.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/47984112630.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/354940260.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/vetorireres.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a36487ce59---90412489877.pdfIn PDF document text
    • http://parentini.it/userfiles/files/57302905768.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/febofaxadekitasu.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/zuzudaniriwize.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/59662962650.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/20737205515.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/zodoserolelisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=minecraft+online+free+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 17100 bytes
SHA-256: fde806d327688cc6488c62c3cf9cc32f4bf65a5447515dabd0b6d004d91c2d0a
font_01_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 10296 bytes
SHA-256: 5f81a8ad78f5f37068ec1269fb9cd3cfe65d7f12af614cdffe50bbc4a324e86e
font_02_sfnt_off00011e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1